Request to ME to verify the M_Prime received from the HDCP sink.
ME FW will calculate the M and compare with M_prime received as part of RepeaterAuth_Stream_Ready, which is HDCP2.2 protocol msg.
On successful completion of this stage, downstream propagation of the stream management info is completed.
v2: Rebased. v3: cldev is passed as first parameter [Tomas] Redundant comments and cast are removed [Tomas] v4: %zd for ssize_t [Alexander] %s/return -1/return -EIO [Alexander] endianness conversion func is moved to drm_hdcp.h [Uma] v5: Rebased. v6: Collected the Rb-ed by. Rebasing. v7: Adjust to the new mei interface. Fix for Kdoc. v8: K-Doc addition. [Tomas] drm_hdcp2_u32_to_seq_num() is used for u32 to seq_num. v9: renamed func as mei_hdcp_* [Tomas] Inline function is defined for DDI index [Tomas] v10: K-Doc fix. [Tomas]
Signed-off-by: Ramalingam C ramalingam.c@intel.com Reviewed-by: Uma Shankar uma.shankar@intel.com Acked-by: Tomas Winkler tomas.winkler@intel.com --- drivers/misc/mei/hdcp/mei_hdcp.c | 67 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 66 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c index c06a9805ac85..721376fc9bf1 100644 --- a/drivers/misc/mei/hdcp/mei_hdcp.c +++ b/drivers/misc/mei/hdcp/mei_hdcp.c @@ -540,6 +540,71 @@ mei_hdcp_repeater_check_flow_prepare_ack(struct device *dev, return 0; }
+/** + * mei_hdcp_verify_mprime() - Verify mprime. + * @dev: device corresponding to the mei_cl_device + * @data: Intel HW specific hdcp data + * @stream_ready: RepeaterAuth_Stream_Ready msg for ME FW verification. + * + * Return: 0 on Success, <0 on Failure + */ +static int mei_hdcp_verify_mprime(struct device *dev, + struct hdcp_port_data *data, + struct hdcp2_rep_stream_ready *stream_ready) +{ + struct wired_cmd_repeater_auth_stream_req_in + verify_mprime_in = { { 0 } }; + struct wired_cmd_repeater_auth_stream_req_out + verify_mprime_out = { { 0 } }; + struct mei_cl_device *cldev; + ssize_t byte; + + if (!dev || !stream_ready || !data) + return -EINVAL; + + cldev = to_mei_cl_device(dev); + + verify_mprime_in.header.api_version = HDCP_API_VERSION; + verify_mprime_in.header.command_id = WIRED_REPEATER_AUTH_STREAM_REQ; + verify_mprime_in.header.status = ME_HDCP_STATUS_SUCCESS; + verify_mprime_in.header.buffer_len = + WIRED_CMD_BUF_LEN_REPEATER_AUTH_STREAM_REQ_MIN_IN; + + verify_mprime_in.port.integrated_port_type = data->port_type; + verify_mprime_in.port.physical_port = mei_get_ddi_index(data->port); + + memcpy(verify_mprime_in.m_prime, stream_ready->m_prime, + HDCP_2_2_MPRIME_LEN); + drm_hdcp2_u32_to_seq_num(verify_mprime_in.seq_num_m, data->seq_num_m); + memcpy(verify_mprime_in.streams, data->streams, + (data->k * sizeof(struct hdcp2_streamid_type))); + + verify_mprime_in.k = __swab16(data->k); + + byte = mei_cldev_send(cldev, (u8 *)&verify_mprime_in, + sizeof(verify_mprime_in)); + if (byte < 0) { + dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte); + return byte; + } + + byte = mei_cldev_recv(cldev, (u8 *)&verify_mprime_out, + sizeof(verify_mprime_out)); + if (byte < 0) { + dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte); + return byte; + } + + if (verify_mprime_out.header.status != ME_HDCP_STATUS_SUCCESS) { + dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n", + WIRED_REPEATER_AUTH_STREAM_REQ, + verify_mprime_out.header.status); + return -EIO; + } + + return 0; +} + static __attribute__((unused)) struct i915_hdcp_component_ops mei_hdcp_ops = { .owner = THIS_MODULE, @@ -553,7 +618,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = { .get_session_key = mei_hdcp_get_session_key, .repeater_check_flow_prepare_ack = mei_hdcp_repeater_check_flow_prepare_ack, - .verify_mprime = NULL, + .verify_mprime = mei_hdcp_verify_mprime, .enable_hdcp_authentication = NULL, .close_hdcp_session = NULL, };